Improvement in locks for fire-arms



J .V P. LINDSAY.

M'uzzle-Loading Fire-Arm. No. 30,332. l Patented Oct. 9, 1.860

JOHN PARKER LINDSAY, OF NEW YORK, N. Y.

IMPROVEMENT |N LOCKS FR FIRE-ARMS.

Speciiioation forming pait of Letters Patent No. 305332, dated'vOctober 9, 186th To all 'whom 'it may concern:

Be it known that I, JOHN PARKER LINDSAY,

of the city, county, and State of New York,

have invented a new and useful Improvement in Locks for Fire-Arms where twoj or/ more hammers are used; and 1"do'.h `ereb'y declare that thefollowing is a full, clear, and exact description of the construction, character, and operation of the same, refereneeybeing had to the accom paniying drawings, 'which make part of this specification, in whichy Figure l is a longitudinalsection, of a.A pistol cut vertically tLrough the center, showing one of the hammers as cocked, with itsmainspring and sear', and the trigger, With/the detent which prevents action Onthe vs ear'of the other hammer. Fig. 2 is asimilar section, showing two hammers, the left one afs eocke'd=, with its' mainspriug, sear, 85o'. Figari?) and 4E are plans ofthe two sears. j Fig.; 5-isla" plan` of the trigger. Fig. 6` is a transverse section, showing the vrelative positions of the trigger.

and two sears, with their fulcrum-pin. 1 1 j My improvement consists Ain theusefof a detent, which is Operated. by'one of ythe hannmers so as to arrestthe trigger ands: prevent action on the second sear until the trigger has been released by the finger and. thrown forf Ward by the action of -the detent, when'the detent is vibrated by its properspring,` and then by again pulling on the trigger it will vactl on'the second sear to release the second hami mer to ignite the next charge.

`Imakethe frame A A A of cast-brass, or any other suitablematerial, substantially in the form represented in Figs. -1 and 2, affording proper supports for the fulcrumpins on which the hammers, 'sears, &c., vibrate, and especially the curved support or fulerum on which the mainsprings l-rest and rock, as shown at a., Figs. 1 and '2, in which there may bel placed screws to setup the lrain'- springs. i

I make the hammers of steel, or any other suitable materiable, substantially in the usual form; as shown at B and-C, Figs. l and 2, making the lower end-of the one, B, to re the irst or front charge, with a projection or foot, as b, Fig. l, so that while'drawing back the hammer B to cock the piece the projection b will-act upon the detent c, so as to cause the `front end to correspond with and enter the notch or space at e, Fig. 1, yin the trigger d, Figs. l, 2, and 6, which detent will absolutely prevent drawing back the trigger so as to act upon the sear y, Figs. 2, 3,4 and 6, ofthe hammer G, so that thehammer C cannotbe let down to ignite the rear charge-whilethe hammer Bj is cocked, a-s-'shown-in Fig. 1, nor until l'after ythe trigger d has 4been 'thrown forwardsoas to release the detent c, by a spring,

` as h,"when theftrigger may bebrought to act on thejsear g, Figs.l 2, 3,:a-nd

1 make the sears' of steel, or any other sult- 'ahle material', substantially in the form shownand in each'of" these sears I-make va reeess,'as indicated in Fig. 4, 'Whiclr leaves va space .to

catedin` Fig. 5, and shown'in' vcrosssectionin Fig. 6., Thesel two "sears,jgv and @,wand the trigger d all work on the same fulcrlun-pin,

k, as shown in Fig s. 1, 2and 6;

L l make the trigger d -of steel, or. any other sui-table imaterial, substantially lin the foriu4 representedin Figs. 1, 2,1- 5, yand 6, withshoulders a'tth'e. recesses, 'so shaped as to'. act 1n aproper'manner on the lower pointsof the sears,

as shown in Figs. 1 and '2,' and. the notch e',

Figs'. 1 and 5, in the proper. place and of the proper dept-l1' to receive and sustain the detent o. l

' .I make the mainsprings l substantially in the shape shown in Figs. 1 and 2, with particular reference to the curve` near' the vrear end to fitthe curved projectionpr support shown at a, Figs. 1 and 2; andin this projection a set-screws may be used, as indleated in Fig. 1, to set up eitherof the springs should they at any time appear too we ak. i

I insert the scar-springs as indlcated atm,

-Figs. 1 and 2, or in any other suitable position.

double-barrel guns with one charge in each barrel, and also to vmy repeating-cartridge patented July 24, 1860.

I am aware that mainsprings have been 4used substantially of the form herein de- This improvement is equally applicable to of the curved fulcrumv but scribed; but in use they have been made to structaed,l combined, and Ymade to produce t-he rest directly on the butt-end. I therefore do required result, substantially as herein sei', not claim the form of the spring irrespective forth.

That I claim as my invention,- and desire JOHN PARKER LINDSAY to secure by Letters Patent,"s Witnesses:

The use of the detentincombination with the R. FITZGERALD, 11a-miner :md trigger, when the whole is con- E. CRAIG. 

